1 /*
2 * linux/fs/ext3/xattr_security.c
3 * Handler for storing security labels as extended attributes.
4 */
5
6 #include <linux/security.h>
7 #include "ext3.h"
8 #include "xattr.h"
9
10 static size_t
ext3_xattr_security_list(struct dentry * dentry,char * list,size_t list_size,const char * name,size_t name_len,int type)11 ext3_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
12 const char *name, size_t name_len, int type)
13 {
14 const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
15 const size_t total_len = prefix_len + name_len + 1;
16
17
18 if (list && total_len <= list_size) {
19 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
20 memcpy(list+prefix_len, name, name_len);
21 list[prefix_len + name_len] = '\0';
22 }
23 return total_len;
24 }
25
26 static int
ext3_xattr_security_get(struct dentry * dentry,const char * name,void * buffer,size_t size,int type)27 ext3_xattr_security_get(struct dentry *dentry, const char *name,
28 void *buffer, size_t size, int type)
29 {
30 if (strcmp(name, "") == 0)
31 return -EINVAL;
32 return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY,
33 name, buffer, size);
34 }
35
36 static int
ext3_xattr_security_set(struct dentry * dentry,const char * name,const void * value,size_t size,int flags,int type)37 ext3_xattr_security_set(struct dentry *dentry, const char *name,
38 const void *value, size_t size, int flags, int type)
39 {
40 if (strcmp(name, "") == 0)
41 return -EINVAL;
42 return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY,
43 name, value, size, flags);
44 }
45
ext3_initxattrs(struct inode * inode,const struct xattr * xattr_array,void * fs_info)46 int ext3_initxattrs(struct inode *inode, const struct xattr *xattr_array,
47 void *fs_info)
48 {
49 const struct xattr *xattr;
50 handle_t *handle = fs_info;
51 int err = 0;
52
53 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
54 err = ext3_xattr_set_handle(handle, inode,
55 EXT3_XATTR_INDEX_SECURITY,
56 xattr->name, xattr->value,
57 xattr->value_len, 0);
58 if (err < 0)
59 break;
60 }
61 return err;
62 }
63
64 int
ext3_init_security(handle_t * handle,struct inode * inode,struct inode * dir,const struct qstr * qstr)65 ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
66 const struct qstr *qstr)
67 {
68 return security_inode_init_security(inode, dir, qstr,
69 &ext3_initxattrs, handle);
70 }
71
72 const struct xattr_handler ext3_xattr_security_handler = {
73 .prefix = XATTR_SECURITY_PREFIX,
74 .list = ext3_xattr_security_list,
75 .get = ext3_xattr_security_get,
76 .set = ext3_xattr_security_set,
77 };
78